October 1968	Issue 6 December 1969	Issue 7 January 1970	Issue 11 May/June 1970	Issue 12 July 1970	Issue 17 February 1971
Issue 21 June 1971	Issue 22 July/August 1971	Issue 23 September 1971	Issue 24 October 1971	Issue 26 December 1971/ January 1972	Issue 36 February 1973
Issue 38 April 1973	Issue 39 May 1973	Issue 41 July 1973	Issue 42 September 1973	Issue 43 October 1973	Issue 44 November 1973
Issue 45 December 1973/ January 1974	Issue 47 March 1974	Issue 52 October 1974